Use this security logo:
Cards manufacturer description
A collection of patience (i.e. single-player) card games. Included are: Aces Up, Black Widow, Canfield, Demon, Double Klondike, Double Solitaire, Grounds for Divorce, Fan, Forty Thieves, FreeCell, Golf, Gypsy, Klondike, Maze, Mod 3, Montana, Penguin, Pyramid, Regiment, Russian Solitaire, Sanibel, SeaHaven Towers, Simple Simon, Spider, TriPeaks, Union Square, Wasp, Whitehead, and Yukon.
Includes hints, unlimited undo, scoring, explanations of the rules (at long last, though still missing for a few games), automatically moving Cards 0.98 to the foundations, and "intelligent" moving of Cards Solitaire when you left click on them (not right-click as in previous versions - that now moves a card to the foundations).
After installing choose "Cards" from Firefox's Tools menu.